At the risk of repeating other comments or the mods/admins confessions I will reiterate or add these observations:
Powers of elucidation and verbal analysis limited to “crap” in all of its variations (crappy, etc.). This misused and overused word adds nothing to an intelligent discussion. If Knowledge is Power, this is the language of the mental weakling. And no, I am not suggesting that they expand their vocabulary by using “suck, suckz, sucky, etc” instead.
Overbearing, arrogant, or hostile behavior by some, especially to new(er) members.
Endless and rude hammering on the “Search” as the simple answer to all questions. Sometimes using the search is difficult and inefficient. If the necessary search terms are not known or phrased properly it can be a time consuming and fruitless exercise. If a respondent really wanted to be helpful, he could suggest the search terms to use for the search and test this terms himself before posting it to see that it brings up the desired results. Excessive use of the “Search” answer indicates the same laziness that may be falsely projected on the questioner.
World’s Greatest Authority On All Things attitude, going on a tangent (off topic) to incompetently criticize a source that has an authoritative and comprehensive explanation of a subject.
Hypocrisy regarding illegal downloads, copy protection, etc. This takes the form of a “holier than thou” stance of moral superiority. The reason illegal links and hacks, etc. are not allowed on forums is that they will be closed if they don’t comply with legal requirements. Pressure from ISP’s due to complaints from software companies can close a site in no time and the operators know this. This doesn’t change what members are doing. They just can’t talk about it. 
The need to be “right”. This forum is about enhancing knowledge. It is for seekers of knowledge, not a platform for rigidly dogmatic opinions. It is not a debating society where winning an argument is everything and it is impossible to change our minds and admit that the opposing position has merit and we have learned something. Admittedly, it is human nature to want to be right and we are somewhat competitive in that regard, but how do we learn if we are always already “right”. We can’t, because we are mired in an untenable position, and the overweening ego binds us. 
Always having to have the last word. Rather childish, sort of like “shut up”, “you shut up”, “no, you shut up”.
Rigid, dogmatic, undescriptive opinions on hardware and software. Intel is wonderful, VIA is crap. Anybody that buys Plextor instead of Lite-on is crazy. Nero is wonderful, Sleazy CD Creator is crap. Packet Writing is crap. **** media is crap media. This black or white, love or hate world view is contradicted by millions of users who use the badmouthed products happily and successfully for their own reasons and requirements. In fact, a person who has proven unsuccessful in using hardware or software is the least qualifed person to give advice on how to use it and the last person who should be listened to. 
On the other hand, to be fair, there are mods/admininstrators who are truly excellent. They are extremely knowledgeable without flaunting it, unfailingly patient, helpful, fair, courteous, and generally treat people in the same way that they would like to be treated. In my opinion, the most important attribute of a mod/admin is his demeanor, and not his knowledge.
moderator: Someone who mediates disputes and attempts to avoid violence.
Unfortunately, some moderators are better at disputing than mediating, and require a moderator themselves to handle their arguments.